[ibmikey]

You obviously have a pistol that was incorrectly marked with a 38 model number, it was and is a shooter but holds no extra collector value unless someone would collect factory mistakes and then they would most certainly want the box, grips and other goodies inside.

 

[ibmikey]

Smith has not serialized barrels for over fifty years, the cost of a letter from Roy Jinks would far out cost any potential increased value of a mismarked pistol. The gun is a shooter take it out and enjoy it.

 

[ibmikey]

Looking at the photos the cylinder and barrel match for .357, as I recall from my S&W revolver school days the cylinder is longer and the barrel protrusion (forcing cone) shorter on the mag to accommodate the extra cartridge length. I am not at home or measuring my 64 and 66 models would confirm this. Some assembler used the wrong stamp on the frame, probably before his first cup of coffee.

 

[ibmikey]

If the dollar value is your consideration price them as you wish but be prepared to accept what a standard 64 or 65 is worth today with the flood of $259. police trade in’s that still abound.